schema: combined load & update methods

volatile loading & parsing
neater iterator for load method

removed parse method from parser (block parsing)
added test for SQLExecutionException
code cleanup
update table version automatically

set version comment in database using version tag
separate update method
cleaned up parser code
handle tags in multiline comments
throw exception when last statement is incomplete
added vim markers
added more vim markers
moved identifier replacing to schema class
renamed functions and variables

categorise  > split
parseLine   > parse
make sure files are handled in alphabetical order
cleaned up schema class
cleaned up sqlparser class
trigger warning when file load glob returns empty
cleaned up tests
added phpunit configuration file
added fallback for inaccessible information_schema